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Add m4 macro to check for C __attribute__ features 

Signed-off-by: Amitay Isaacs <amitay@ozlabs.org>
This commit is contained in:
Amitay Isaacs 2018-07-10 14:38:50 +10:00 committed by Erik de Castro Lopo
parent f301518c52
commit 08d9d985da
1 changed files with 18 additions and 0 deletions
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18
m4/c_attribute.m4 Normal file
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@ -0,0 +1,18 @@
#
# Check for supported __attribute__ features
#
# AC_C_ATTRIBUTE(FEATURE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
#
AC_DEFUN([AC_C_ATTRIBUTE],
[AS_VAR_PUSHDEF([CACHEVAR], [ax_cv_c_attribute_$1])dnl
AC_CACHE_CHECK([for __attribute__ (($1))],
CACHEVAR,[
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[[ void foo(void) __attribute__ (($1)); ]])],
[AS_VAR_SET(CACHEVAR, [yes])],
[AS_VAR_SET(CACHEVAR, [no])])])
AS_VAR_IF(CACHEVAR,yes,
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl